Bending machine



Jan. 1925- 1,523,594

A. HOSSFELD BENDING MACHINE Filed July 11, 1923 Sheets-Sheet 1 In VE/V 7100. /9L BERT 1/0 53 Fit. 0.

A. HOSSFELD BENDING MACHINE Filed July 11, 1923 2 Sheets-Sheet 2 Patented Jan. 20, 1925.

UNITED STATES ALBERT HO'SSFELD, OF LEVTISTON, MINNESOTA.

.. BENDING MACHINE.

Application filed July 11,

To aZZ 10 item it may concern Be it known that I, ALBERT HOSSFELD, a citizen of the United States, residing at Lewiston, in the county of Winona and State of Minnesota, have invented certain new and useful Improvements in Bending Machines; and I do hereby declare the fol lowing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it ap pertains to make and use the same.

This invention relates to a bending machine of a simple type adapted to bend cold or hot material, the machine being of a type adapted to be attached to a post or bench in a shop and being operable by hand. Such bending machines are of great utility in small blacksmiths shops, garages, farm shops, spring factories, etc.

It is an object of this invention to provide a simple and compact bending machine of minimum size and weight which will quickly and efficiently bend bars up to approximately one inch in diameter or of cross section one-half inch by three inches, as well as tubing and piping.

It is a further object of the invention to provide such a machine comprising a fixed frame and a bending frame swingingly connected thereto, said frames being adapted to carry various bending anvils and bending members, which members preferably are adjustably held in position.

it is more specifically an object of this invention to provide such a machine having a main frame and bending frame, both comprising spaced horizontally disposed bars connected by a vertical pivot pin together with adjustable means on said frame for accurately bending flat bars into curved, as well as sharp angular bends and to bend rods and flat' stock into eye bars which bends are perfectly made.

it is more specifically an object of the invention to provide such a machine as above described having a spacing block be tween the horizontal members of the main frame apertured to receive the stems projecting from various bending members, such as an oscillatable spring bending anvil or a bending yoke for making square bends in flat stock, together with means for adjustably holding said stems in said spacing block. 1

It is also an object of the invention to provide means mounted at the top of the 1923. Serial N0. 650,344.

main and bending frames, respectively, for making sharp angular bends in flat or round stock. 1

These and other objects and advantages of the invention will be fully set forth in the following description made in connection with the accompanying drawings in which like reference characters refer to the same parts throughout the different views, and in which,

Figure 1 is a plan View of the machine;

Fig. 2 is a View in front elevation of the machine Fig. 3 is a View in side elevation thereof, as seen from the left of Fig. 1;

Fig. 4 is a horizontal section taken on the line 4.4 of Fig. 2;

Fig. 5 is also a plan view of the machine with other parts in place therein;

Fig. 6 is a view in front elevation of the machine arranged as; shown in Fig. 5 with the frames in oppositely extending position;

Fig. 7 is a. horizontal section taken on the line 77 of Fig. 6; and

Fig. 8 is a partial plan view showing the machine equipped for bending pipe. In Figs. 4 and 8, adifferent position of the parts is shown in dotted lines.

Referring to the drawings, the machine comprises a main or stationary frame comprising the spaced horizontal bars 1 bent at one end to be disposed somewhat adjacent each other and bolted together in spaced relation by headed and nutted bolts 2. The main frame is adapted to be connected to a post, work bench or other similar suitable member and, in the embodiment of the invention illustrated, the same is shown as secured to a bench by being bolted to the brackets 3 which are, in turn, bolted tothe bench &. The bars of the main frame are each provided with a series of spaced vertically extending and alined holes 5. A. spacing block 6 is held in position between the bars 1 somewhat adjacent the rear of the stationary frame, which block is held by a bolt or pin extending through a pair of holes in said bars and in the embodiment of the invention illustrated, said block is held by a bolt which also forms a securing bolt attaching the frame to the bracket T he spacing block 6 has a lug 7 projecting laterally therefrom at its front side, the front surface of which is flat and extends across said block and forms the front surface of a cylindrical boss 10 which extend and ,is aperturedfuto receive a :stem 8 projecting from and secured to the adjacent we ends of a closed yoke ,memberfi. Thestem 8 is equipped with a nut 11 threaded thereon and bearing against the boss o1 1: the rear 01 the block 6. The yoke 9 is formed with right angle bends at-:its;= i 'ro,nt :portion and is of material which is rectangular in cross. section.

A rbending :frame is provided comprising spaced horizontal bars 12 bent to lie some- What closely adj acent: at oneendwhere they are spaced by a flattenedrhollow handle member 13 and -to which they-are :secured by spacedrheaded and; nutted bolts 14. The bending :frame lis pivoted to #the main frame by a-pivot; pin .15 extending through al-ined vertical holes adjacent the rends of said framesoand :said pivot: pin hasiva :portion of redi'iced' diameter at: its upper end and a portion of reduced diameter at its lower-end belorvuzthellower: bar 1 supported upon a swinging supporting member-16 carried by a? Eheadedl and nutted bolt 17 extending through one of the holes inv thenbar'l. As sliown;i=n,.Fig. 1,'the supper and lowervsides of the membersi16 are not inialinement and the pivot-pi11fl5 ma-y besupported upon 'the upper-side orzthe :lO WBlrSldflDf said member. Theibolt :17'also passesithrough onev end of a ,flat member-18 extending :rearwardly and I provided .with a. U bend through which passes-a headed and nutted bolt 19, which bolt also passes through 10118 of the vertical holes infthe lower barl. A circular gauge supporting member 20 prelierably formed from .a round rod hassits ends bent around the bolt 19.andwdisposed, respectively, above the member 18 andin the-Ueshaped ib'end therein. i lsrod v2l has its innerwendaibent around the bolt 17 Zandrspacedfrom "the member 1 6- by washers 22,-, and .=said rod carries, 1a lU-shaped gaugemember 23, said member beinguadjustably :held thereon by a set screwn2-it and haVi-ngaverticallyextendin'g gauge pin secured therein. Another gauge block 34- is also slidably mountedon the gauge. supporting IDGIIlbQIWQOwEl-Ild held in adjusted position thereon Joy a thumb screw. An anvil or EPI'GSSQY- block member 26"rhaving one side of angular shapeis mounted on the pivot pin 15 between the bars 12. An

other anvil blocki27csubstantially square in cross section has verticalholesextending eccentrica l ly :therethrough and is held between the bars 12 bya pin'28 extendingthrough a hole therein and a pair of the alined holes 12 in the-bars :12. The pin 28 has-a flattened ihead projecting through a-slot formed longitudinally in a member 29' having a triangular pointed outer end anda threaded stem at its inner end, which stem passes through the aperturedruppeiwendof a pin 30 extending through one ofthe holes in theatop'sbar 12 and havingwa reduced portion extending through the bottom hole therein, said pin being thus supported on thelower bar ,12. The upper end of pin 30 'is transversely apertured to receive a split key bearing on member 29 and supporting A knurled nut 31engages the threaded istemhof imember 29 and bears said pin.

used *forbending fla t bars into sharp angle bends; In'theoperation,a piece of flat stock shown as a in Fig; 4 isinserted against the pr-esser block 26 t-hrough the-end af the yoke 9 and the bending 1 frame is swung substantially ataright angles to the main-frame, as shown in Fig. 4, and the anvil-block 27' brought squarely-against the 'sideof thestock a. The-bendingframe ismow-swungin a clockwisedirection and the stock a is bent, as

indicated by the dotted'line-sin Fig.4, a sharp V bend beingformed the-rein about the inner corner otthe yOkemem-ber-QJ The presser block 26 and the anvil bloc'k 27' are in'c'lose proximity to the end of the-yoke 9 and the sharp turn is thus-madein stock a without any objectionable-curling outwardly at the edgesof the stock. If the bar-of stock is not thus contacted closely adjacent the bend, this objectionable curlingof the edges will occur and a perfeot'bend will not be formed. Furthermore,theclose proximity of the anvil niemb'er '27 to' the bendingmember 9 causes the side ot theyoketo-contact closely the sides ofthe-men'rber 9 so that a very sharp angle ibend i-s produced. The block 26 is, of course, free to turn on its axis if necessary. At thestart of the bending operation, however, one 'fiat side of the block isinposition against theside oii' the yoke 9.

A fiat bend can also beinade in a'smaller pieceot round or angular stock 'bymeans of the members 29 and32. The bending frame is swung in" a counterclockwise direction to,

stand atsubstantia lly a right angleto the main frame and "the pieceof stock is placed across the endqof the member- 32 passing between the same andtheupstandingportion of pivot pin 15 and is engaged-on the iii lying along side of said member. The members 29 and 32 may be adjusted longitudinally of the main frame and bending frame so as to be brought to the desired position to suit the stock. It will be also understood that the blocks 26 and 27 can be disposed in other positions on the main frame and bending frame by inserting their supporting pins through other pairs of holes provided. The yoke 9 can be adjusted longitudinally of the main frame so as to be brought to the desired position by manipulation of the nut 11. In the arrangement of the machine shown in Figs. 5, 6 and 7, the yoke 9 is removed from the block 6 and an anvil member substituted therefor. This member comprises an eye bolt 40 having a threaded stem extending through the block 6 and equipped with an adjusting knurled nut 41. A headed and nutted bolt 42 passes through said eye bolt and arms 43 which have lugs disposed at each side of said bolt and clamped thereto by the bolt 42. The arms 43 diverge and have horizontal port-ions carrying inwardly directed pins which seat in apertures formed in lugs 44 disposed at each end of a. semi-cylindrical block 45. The arms 43 also have pairs of lugs 46 projecting at each side of the bars 1 forming means for guiding said arms longitudinally of the bars when the nut 41 is operated. A coiled tension spring 47 is secured to one side of a block at one end and has its other end secured to the eye bolt 40. A bending member 48 formed of a flat plate is disposed between the bars 12 of the bending frame and is riveted to an offset bar 49, said bar and plate extending on opposite sides of a pin 28 which forms a guiding means therefor. The inner end of the handle member seats in a recess formed in the end of bar 49 and said bar is kept in contact with said end by a tension spring 50 secured to said bar and to one end of the. handle members 13. It will be understood. of course, that the blocks 26 and 27 are removed when the plate 48 and bar 49 are used. The machine, otherwise, is the same as already described in connection with Figs. 1 and 4.

In the use of the machine arranged as shown in Figs. 5, 6 and 7, a flat piece of stock shown as Z) in Fig. 7, preferably adapted for use as a spring, such as used on automobiles and other vehicles, is operated upon. The bending frame is swung to the position substantially shown in Fig. 5. The stock is then inserted between the block 45 and the pivot pin 15. the same being engaged on the side engaged by the block 45 by the edge of the bending plate 48. The bending frame is then swung in a clockwise di rection and the end of the piece of stock 7) is bent closely about the. pivot pin 15. lVhen the bending operation is begun the block 45 is in the position shown in Fig. with its fiat side extending parallel to the center line of bars 1. As the stock is bent around, the same contacts strongly against the block 45 and the latter is rotated with the stock as the stock is pulled around the pin 15. The block 45 thus moves with the stock and the spring 47 is extended. If, however, the bending frame be moved backward a. trifle so as to temporarily release the stock the spring 47 will again pull the anvil to the position shown in Figs. 5 and 7. It will be noted that the surface of block 45 lies very close to the pin and the piece of stock is contacted throughout its width by the edge of the plate 48. The end of the stock is thus bent about the pin 15 and the eye formed therein without any chance for the stock to curl outwardly at the edges as it will do if it is not contacted firmly adjacent the bent portion. The block can be adjusted to suit the stock by manipulation of nut 41. The bending plate 48 can also be moved toward the pivot of the frames by advancing the jaw rod 35. lVhen said jaw rods retract the spring will pull the plate 48 and bar 49 outwardly.

In Fig. 8, both the yoke 9 and the spring bending block 45 are removed with their attached parts and a block 51 is used. This block is somewhat elongated with curved sides having formed therein semi-circular grooves. The block is held in position. as shown, between the bars 1 by a pin, extending through a pair of the holes in said bars. A bending roller 52 is carried between the bars 12 on a pin extending through a pair of holes therein. The block 51 is adapted for the bending of pipe or tubing and in the operation thereof, a piece of pipe 0 will be placed against the flat side of the spacing block 6 extending between the same and one side of block 51. The bending frame is now swung to the position indicated in dotted lines in Fig. 8 and the roller 52 brought against one side of the pipe. The bending frame now being swung clockwise. the pipe will be bent, as shown in full lines in said figure. By moving the pipe slightly be tween the. bending operations, the same can be bent into a complete circle or in a plurality of coils.

Vhere several pieces are to be bent in the machine to the same angle. the gauge members 23 and 34 may be used. The member 23 can be used to locate the end of the piece of stock to be bent and the member 34 can be set to proper place on the supporting member 20 to indicate the angle to which the: stock is to be bent. The thumb screws used to position the members 23 and 24 can be easily operated and said members quickly adjusted.

From the above description it is seen that applicant has provided a simple, compact l'lO an very i effieient -'bending-1nae11='ine and one Which'vvill have a very l'iighdegre'e ofutility in small shops, garages "and 5 other places- Where a comparatively small stock isto' be bent to form such members 1 as eye bolts;

ol'evi'ses,"links=, 'ci'ro'les, angles; offsets; braces; cranks; etc; The" inae-hine" will also standard pipe-"and tiibi'ng'smroothly andr perfe etly Without fiattening or kinkingw The s urin bend'in -attaehinent -coni 5'risin Ithe' l b t: l a g bloblt '45 oanbe used andthe ma'c 111e' il1 then bend or roll erfect- "eyes for' automobile and other sp-rings'z'j The ma'ohine is made as lightas consistent with" the requisite strength and the various adjustments" ofthe arts can be' qi'liekly-rand easily made." The machine is,*as' stated; very's-impl and-is cap able of handling a large" number" and variety of 'wvorln- The machine i's 'easily" transportable," very durable and is made and sold at a very reaSonahle 'priee;" The Ina'-' 1y and it'ssuec'es's and 'efficieney,- in actual practice, have been thoroughly 7 demon strate'd'." l p 7 It will 'of' course; be understoodfthatvari; ous changes may the inade in the form; '{d'etails, arrangement and proportion's 'of the parts Without "departing fromthe scOp'e of applicants invention,' which; generally stated, consists in a device capable of carry ingout the objects above stated, and such bination,' a; stationary framecomprising spaced substantially parallel members, a

bending frame Comprising spaced parallel members, a pivot connectings'ai'd frames adjacentthe ends thereof; a block j disposed on said ivot having i we" fao'es'j meeting at an angle to form an edge, said fame joined by a curved surface, 'a work conta'cting 'meinb'er"C arified" by said stationary traine a bending 'fin'inb'er Carried by Said bending heme -atlzipted to bend a piece of workeng aged bysaid block and by said werlaengagingg member:

3. A bending machine comprisin a statienary frame,- com rising spacfed' arallel members, a pivot member extent-ling through an'deetw'eensani members, a bloek mounted on said pivot member having a transverse epertnre therethrough at-onesi-de of said "aivot'm1embeiga member adapted to be contacted by the wor k 'carryin'gja threaded stem; said stein passing :throngh" said 211L781; ture; :Ine'ztnsfoi' adjusting. saidlastmen tione'd' niemb'er' longitudinally of said *sta-- tionary frame,- and a bending frame meniber pivbtedto said stationary frame;

4:. A bending machine comprising sta= tion'al y 'frame; 'a'"block ith'erein havinga transverse aperture therethrough, a rectangul'ar' shape'dyoke of rectangulai" crosssee' tion 'di'sposed"in saidstationary frame 'having; its" ends projecting beyond the same; an=--anvi1 block T in i said' stationaiy fram c1ose1y ad=j 'acent said yoke, a bending iframe pivoted to said-stationary flame; and a bending' -anvil of rectangular cross section arried" in said bending Yfr'anie adapted to een-taet with its flat side i a bar of stock ex: tending through said :yoke" and against said mwihbloek; v

yoke being "mounted for movement longi; tudinallj of said stationary frame-, f and means fo'i "moving said; yoke holding theis'ame in varieus ositions:

'6.) The structure setforth in-c1aim-4,'a member rotatabl'y Inounted' in said-main frame about'a-vertic-al axi's,-said yoke having' a stem extending" through 'said member;

and ineans' on said stein for moving and holding said yoke in various positions] 7.'A bendin mach-ine eompris'ing a main frame-,a bending frame, a 'men'iber mounted at the top of said mainframe having a fiat side surface 'andfa sharp corner at 'oneen'cl, a member mounted at the top of'sai'd bend ing frame and having a sharp bending edge forbending a piece of Workaboutsai'd first mentioned member, a pivot "member" c'onnec'ting' said frames and projecting between said members to foi'in'a Work anvil about Which-a piece of work 'he'ld said first menti-ene'd member may b 'bent by said seron al entio ed member. r

- 8.- Thestrueture set forth in claim 7-. said members on 'the top of sai'd' mainframe and bending 'frainebeing" movable, longi t'ti'd iiially 'res jeetively, on said "frames, and means for holdih'g said-members in plurality of positions thereon.

9. 'A -'bendi11-g'-' machine comp-rising a stationary-frame having vertically spaced ho'ri zo'ntal bars; a bei-lding name equipped with a handle also formed of vertically spaced horizontal bars, a pivot pin connect *sai'd- "frames and eXtendin'g above the same adajb't'edto have Work bent'thereabout and memberdis osedbeneath sai'd fraines havihg' spaeed u'pp'enan'd lower-arm's f'or si'i'pportiii-g said pivot pin.

5-. The struetdreset-forth in e1aim 4-,"said V 10. A'ben-ding' machine comprising a sta- I tiona'iflv framehavifig vertically spaced horizontalbarsya bending'frame having verti'cal 1y spaced-horizontal bars, a pivot pineon' neeting the "ends of the bars of said names,

a block carried between said bars on said pivot pin and having angular surfaces at one side, a yoke member extending longitudinally between the bars of said stationary frame and contacting one of the surfaces of said block, and a block rectangular in cross section eccentrically mounted between the bars of said bending frame and adapted to co-operate with said block and yoke in the bending of the work.

11. A bending machine having in combination, a stationary frame, a bending frame, a pivot connecting said frames, a block having a longitudinal bore therethrough through which said pivot extends, said block having two substantially plane surfaces intersecting at an angle to form a longitudinal edge, said surfaces being joined by a substantially cylindrical surface.

12. A bending machine having in combination, a stationary frame, a bending frame including spaced members, a pivot member connectingi said frames at their ends about which work is adapted to be bent, a block carried. by said stationary frame and disposed between said spaced members thereof, a work engaging member carried by said stationary frame, means engaging said block as a base of re-aotion for adjusting said work engaging member longitudinally of said stationary frame, and an adjustable work bending member carried by said bending frame.

13. A bending machine having in combination, a stationary frame, a bending frame, a transverse pivot member connecting said frames adjacent their ends, a substantially rectangular yoke member disposed in a plane substantially parallel to the axis of said pivot member, means for adjusting said yoke longitudinally of said stationary frame, and a bending member adjustable longitudinally of said bending frame for engaging and bending work held in said yoke.

14. The structure set forth in claim 13, said yoke having top and bottom sides and an end portion of angular cross section connecting the said sides, said bending member having a work-engaging portion parallel with the edges of said end portion of said yoke.

15. A bending machine having in combination a stationary frame comprising spaced substantially parallel members, a bending frame comprising spaced parallel members, a pivot connecting said frames adjacent the ends thereof, a block carried by said stationary frame, a work engaging member carried by said stationary frame and movable longitudinally thereof including means extending through said block, a member engaging said means and block adapted to adjust said work engaging member longitudinally of said frame, and a work bending member carried by said bend ing frame and extending between said parallel members thereof.

16. A bending machine having in combination, a stationary frame, a bending frame, a pivot member connecting said frames at their ends about the axis of which work is adapted to be bent, a work engaging member carried by said stationary frame, said member comprising two surfaces intersecting to form an edge, said member including a curved surface with which the work contacts, means for moving said work engaging member longitudinally of said stationary frame, and a bending member in said bending frame for engaging the work and bending the same.

In testimony whereof I affix my signature.

ALBERT HOSSFELD. 

